
Abbott’s bitters is a brand of aromatic cocktail bitters, a concentrated spiced seasoning added in dashes.
Warm spice in dash strength, and the blends nearby differ in which spices lead rather than in how bitter they are. Dose stays the same; what changes is the direction of the seasoning.
The nearest aromatic bitters by role, and a dash goes for a dash; the seasoning shifts towards clove and gentian; the warm cinnamon-and-nutmeg side goes.
A historic brand of the same family, led by cardamom and peel, and the dash count stays; the drink turns brighter and less warm.
A recreated historic formula, and small-producer bitters vary batch to batch more than the big houses do — worth tasting a new bottle against the old before assuming they are identical. Stored closed and dark it keeps indefinitely.